A10 Networks Thunder SSL Insight (SSLi) vs Fortinet FortiADC comparison

Why PeerSpot?

The compared A10 Networks and Fortinet solutions aren't in the same category. A10 Networks is ranked #2 in STD , and holds a 22.3% mindshare in the category. Fortinet is ranked #8 in ADC , with an average rating of 8.3, and holds a 7.7% mindshare. Additionally, 75% of A10 Networks users are willing to recommend the solution, compared to 86% of Fortinet users who would recommend it.

A10 Networks Thunder SSL In...

Read 3 A10 Networks Thunder SSL Insight (SSLi) reviews

961 Views
413 Comparison Views

75% willing to recommend

Fortinet FortiADC

Read 25 Fortinet FortiADC reviews

6,816 Views
5,453 Comparison Views

86% willing to recommend

A10 Networks Thunder SSL In...

Fortinet FortiADC

Comparison Buyer's Guide

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Executive Summary

We performed a comparison between A10 Networks Thunder SSL Insight (SSLi) and Fortinet FortiADC based on real PeerSpot user reviews.

Find out what your peers are saying about Broadcom, A10 Networks, Gigamon and others in SSL/TLS Decryption.

To learn more, read our detailed SSL/TLS Decryption Report (Updated: October 2026).

Buyer's Guide

SSL/TLS Decryption

October 2026

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Helped 917,433 peers since 2012

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Categories and Ranking

A10 Networks Thunder SSL In...

Average Rating

9.0

Number of Reviews

Ranking in other categories

SSL/TLS Decryption (2nd)

Fortinet FortiADC

Average Rating

8.0

Reviews Sentiment

6.7

Number of Reviews

Ranking in other categories

Application Delivery Controllers (ADC) (8th)

Mindshare comparison

A10 Networks Thunder SSL Insight (SSLi) and Fortinet FortiADC aren’t in the same category and serve different purposes. A10 Networks Thunder SSL Insight (SSLi) is designed for SSL/TLS Decryption and holds a mindshare of 22.3%, down 31.8% compared to last year.
Fortinet FortiADC, on the other hand, focuses on Application Delivery Controllers (ADC), holds 7.7% mindshare, down 9.4% since last year.

SSL/TLS Decryption Mindshare Distribution
Product	Mindshare (%)
A10 Networks Thunder SSL Insight (SSLi)	22.3%
Symantec SSL Visibility Appliance	25.0%
Fidelis Elevate	19.0%
Other	33.7%

SSL/TLS Decryption

Application Delivery Controllers (ADC) Mindshare Distribution
Product	Mindshare (%)
Fortinet FortiADC	7.7%
F5 BIG-IP Local Traffic Manager (LTM)	11.6%
NetScaler	11.6%
Other	69.1%

Application Delivery Controllers (ADC)

Featured Reviews

Kenneth Murray

Data Center Network Engineer at BRIDGETON PUBLIC SCHOOLS

Enables our content filter to do its job without any noticeable delay

Its most valuable feature is its ability to do its job accurately, effectively, and very quickly. The amount of traffic that we have going through our system is astounding. We have 6,900 students and about 1,100 staff members. Most of our teachers and staff are connecting through our system. You add to that all the cell phones, the iPads, and all the computers, and then each individual website's connection, that's a lot of traffic in a period of one second. The delay with the SSL decryption turned on is almost unnoticeable. That is great because most SSL decryption solutions — a couple of competitors we did try — their devices crashed as soon as we turned decryption on.

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Suraska Sanjaya

Team Lead at Adapt Information Technologies (Pvt) Ltd

Application load balancing has improved traffic distribution and supports straightforward clustering

I did not explore the advanced features as I only performed load balancing in the application and cluster implementation. I need to study Fortinet FortiADC more. Regarding Fortinet FortiADC reporting, our customer has not requested the reporting part from us, and I have not considered that. There appears to be an advanced reporting part that I am not aware of. The advanced analytics part was not requested from us. The only thing customers expected was load balancing.

Read full review

Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:

Pros

"We have several proxies in our environment, so we localized internet traffic between these proxies. Instead of getting a really huge proxy box, according to our size, we can use three boxes and share the traffic with A10's load-balancer feature."

"This is one of those devices that, once you turn it on and it's functioning properly, you'll forget that you have it."

"By not renewing six proxy boxes, rather just three of them, it saved over $100,000."

"With the Thunder SSLi, we're better protected; we can stop use of VPN and proxies, are better protected against dirty traffic coming back to our schools, and having a secure decrypt zone with the equipment lowers the chances that our security infrastructure could possibly miss an attack."

"Its most valuable feature is its ability to do its job accurately, effectively, and very quickly. The amount of traffic that we have going through our system is astounding... The delay with the SSL decryption turned on is almost unnoticeable."

"The most valuable feature is its simplicity."

"The solution is less expensive than F5 or Imperva and is the most reasonably priced option available."

"We can do patches offline without causing customers outages. The web application firewall features, especially those related to the OWASP Top Ten, provide automated protections. This allows more flexibility in patching the backend applications. Additionally, it offers visibility into the requests being made to the applications, and you can't protect what you can't see."

"Key features include SSL Offloading, VM availability, and L7 load balancing."

"Because ADC is the intermediary between the servers and the end-user application, it gives thorough information about the traffic, what the problem is."

"I like the solution's load balance with DNS intelligence."

"The product has flexible and interesting licensing options."

"FortiADC helps application availability and improves user-response time, and in addition, the price is competitive."

More Fortinet FortiADC pros

Cons

"SSLi is a very powerful device. It has many features and to get them configured is kind of tough."

"It would be great if it supported SSL operations according to Active Directory users. For example, if we want to bypass one of the servers or a client's internet access for SSL interception, we have to do it according to the IP address. It would be better if we could do it according to the Active Directory username. A10 says they kind of support that but we haven't tested it."

"I would like them to have a better UI (better universal design)."

"There is one thing I would like to see changed. In their features for setting things up, there is a templating system that would normally assist clients. However, we had a better time setting up the device either through the command line or through the interface and not using the templates that were pre-installed. So there is room for improvement to the templates for initial installation."

"Fortinet specifies that the solution can be used for 1,000 clients, but actually we've found that you can't go above 400 for content compression and rewriting."

"The initial setup could be simplified."

"Technical support and documentation could both be improved."

"Fortinet has some drawbacks, and it can be a bit challenging to scale."

"If I need design help, they do not assist; they say it is a design issue they cannot support, and I must approach the system integrator."

"FortiADC is complex to configure so the interface should be improved."

"The product’s price could be reduced. Also, some of its features need to be more advanced."

"Because it is so generic, the documentation requires special attention. A person who has not worked on Fortinet FortiADC or a similar product will struggle to understand what the document is trying to say. The documentation could be more specific, and more detailed."

More Fortinet FortiADC cons

Pricing and Cost Advice

"Our licensing costs, yearly, are just under $15,000. Your initial cost of acquisition is obviously going to be more than $15,000..."

"We always pay for support. Any organization of our size who doesn't is asking for problems."

"When you purchase the equipment, you purchase the licensing and warranty. It's all fairly standard. We haven't been caught with anything surprising."

"Our basic license excludes features such as antivirus and IDS. Due to license limitations, some functionalities are not configured."

"I believe the price is good. It's fair. There are no extra costs."

"The solution could be more cost-effective."

"The price is competitive"

"The solution is less expensive than F5 or Imperva and is the most reasonably priced option available."

"They offer a perpetual license."

"I rate Fortinet FortiADC's pricing one out of ten. It is fixed."

"The product has average pricing. I rate its pricing a five out of ten."

More Fortinet FortiADC pricing and cost advice

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Top Industries

By visitors reading reviews

Outsourcing Company

14%

Comms Service Provider

Manufacturing Company

Construction Company

Financial Services Firm

11%

Outsourcing Company

10%

Government

Manufacturing Company

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

No data available

By reviewers
Company Size	Count
Small Business	13
Midsize Enterprise	4
Large Enterprise	7

Questions from the Community

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Is Citrix ADC (formerly Netscaler) the best ADC to use and if not why?

For ADC, any ADC can do a good job. But in case if you want to add WAF functionality to the same ADC hardware you have to look for other ADC's like F5, Imperva, Radware, Fortinet, etc.

See all answers

Do you recommend Fortinet FortiADC?

I recommend Fortinet FortiADC. My experience with Fortinet has been very positive. Our company has been using it for around five years. We mainly use FortiADC for the load balancing of application ...

See all answers

What is your experience regarding pricing and costs for Fortinet FortiADC?

Pricing is not considered on our side since we are the implementation team. Our pre-sales team considers the pricing and all the details.

See all answers

Comparisons

Symantec SSL Visibility Appliance vs A10 Networks Thunder SSL Insight (SSLi)

Compared 14% of the time

GigaSMART vs A10 Networks Thunder SSL Insight (SSLi)

Compared 11% of the time

F5 BIG-IP Local Traffic Manager (LTM) vs A10 Networks Thunder SSL Insight (SSLi)

Compared 10% of the time

Comodo Essential SSL Wildcard Certificate vs A10 Networks Thunder SSL Insight (SSLi)

Compared 8% of the time

Fidelis Elevate vs A10 Networks Thunder SSL Insight (SSLi)

Compared 6% of the time

More A10 Networks Thunder SSL Insight (SSLi) Competitors

F5 BIG-IP Local Traffic Manager (LTM) vs Fortinet FortiADC

Compared 17% of the time

NetScaler vs Fortinet FortiADC

Compared 12% of the time

Barracuda Load Balancer ADC vs Fortinet FortiADC

Compared 10% of the time

A10 Networks Thunder ADC vs Fortinet FortiADC

Compared 8% of the time

Kemp LoadMaster vs Fortinet FortiADC

Compared 5% of the time

More Fortinet FortiADC Competitors

Product Reports

Buyer's Guide

A10 Networks Thunder SSL Insight (SSLi)

October 2026

A10 Networks Thunder SSL Insight (SSLi) report

Download A10 Networks Thunder SSL Insight (SSLi) product report

Buyer's Guide

Fortinet FortiADC

October 2026

Download Fortinet FortiADC product report

Also Known As

Thunder SSLi

FortiADC Application Delivery Controller, FortiADC

Overview

A10 Networks Thunder SSL Insight (SSLi) enhances network visibility by decrypting SSL traffic, allowing enterprises to inspect encrypted data seamlessly.

A10 Networks Thunder SSL Insight (SSLi) is designed for businesses needing in-depth traffic inspection while maintaining security compliance. By decrypting SSL traffic, it ensures deeper visibility into encrypted data without compromising security. It integrates smoothly into existing infrastructures, offering comprehensive analytics and real-time threat detection capabilities, addressing the growing challenge of encrypted traffic in networks.

What are the key features of A10 Networks Thunder SSLi?

Advanced Traffic Decryption: Efficiently decrypts SSL traffic for seamless inspection.
Scalable Integration: Easily fits within existing network architectures.
Comprehensive Analytics: Delivers detailed insights into network traffic.

What benefits can users expect from A10 Networks Thunder SSLi?

Enhanced Security: Improves threat detection by exposing encrypted threats.
Increased Visibility: Provides a clearer understanding of network traffic patterns.
Improved Compliance: Helps ensure adherence to security regulations.

A10 Networks Thunder SSL Insight (SSLi) is widely implemented in finance and healthcare sectors, where data security and compliance are critical. It supports seamless integration that assists these industries in maintaining strict privacy standards while gaining comprehensive insight into network activities.

A10 Networks

Fortinet FortiADC offers reliable load balancing and server management with significant security features, ensuring streamlined traffic control. Its cost-effectiveness and integration with Fortinet platforms make it a compelling choice for businesses seeking scalability and enhanced network operations.

Fortinet FortiADC is designed to deliver streamlined application delivery and manage server traffic effectively. It integrates seamlessly with Fortinet technologies like FortiGate and FortiMail, enabling enhanced security features such as SSL offloading and certificate management. While its load balancing and traffic control are strong, improvements in algorithm precision and technical support are needed. The platform's licensing flexibility and high-level services like failover and redundancy underscore its scalability. However, revisions in configuration interfaces and performance optimizations indicate areas for future updates. A focus on automation and integration with existing FortiManager components could enhance usability.

What are the key features of Fortinet FortiADC?

SSL Offloading: Streamlines secure data handling.
Load Balancing: Manages traffic distribution efficiently.
Web Application Firewall: Ensures robust security compliance.
Content Caching: Enhances response speeds and reduces latency.
Traffic Control: Offers precise network management options.

What benefits should you look for in FortiADC reviews?

Affordability: Offers cost-effective licensing options.
Scalability: Adapts to growing business needs.
Integration: Works well with other Fortinet products for enhanced functionalities.
User Management: Simplified configuration and management processes.
Performance: Consistent and reliable load balancing with high availability.

Industries implement Fortinet FortiADC to improve application and data access, especially where high reliability and secure delivery are critical. It supports local and global content management, efficiently handling disaster recovery and ISP link balancing tasks, crucial for sectors requiring continuous, high-performance connectivity.

Fortinet

Sample Customers

Klein Independent School District

Black Gold Regional Schools, Amadeus Hospitality, Jefferson County, Chunghwa Telecom, City of Boroondara, Dimension Data

Find out what your peers are saying about Broadcom, A10 Networks, Gigamon and others in SSL/TLS Decryption. Updated: October 2026.

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